IT may be two problems: stalling and not restarting or it could be one problem.
We’ll assume it is one problem first:
Did you check the cables from the battery to the starter and to the frame? Clean them off really well, make sure the wires going to the terminals are making good contact, etc.
When you start and it just clicks, do the dash lights go off?
If it ends up being two problems, the not starting part could be something related to the starter. Try whacking the starter by putting a piece of wood on it and hit the other side of the wood to see if it will start again.